Method and an apparatus for processing an audio signal

An apparatus for processing an audio signal, the apparatus comprising:

• an audio signal receiving unit configured to receive the audio signal, the audio signal including a plurality of objects;
• an object infolination receiving unit configured to receive object information including object level information indicating a level of the plurality of objects, and object gain information indicating gains of each of the plurality of objects, and object correlation information indicating correlation between objects;
• a preset information receiving unit configured to:
• receive preset presence information and preset number information, the preset presence information indicating the preset information is available, and the preset number information indicating a number of the preset information,
• receive preset information based on the preset presence information and preset number information, and
• obtain a preset matrix from preset rendering data,
• wherein the preset information includes a preset metadata representing an attribute mode of the preset information, the preset rendering data for rendering the plurality of objects and preset type information indicating whether the preset rendering data is in a matrix type or not,
• wherein the preset information exists in a header region or in each frame,
• wherein when the preset information exists in the header region, the preset information is applied to all frames,
• wherein when the preset information exists in the each frame, then the preset information is applied to a corresponding frame, and
• wherein the preset matrix indicates a contribution degree of the plurality of objects to an output channel;
• an object information processing unit configured to generate downmix processing information based on the object information, the preset metadata and the obtained preset matrix;
• and
• a downmix signal processing unit configured to generate a processed audio signal by controlling a gain or panning of the at least one object included in the audio signal based on the downmix processing information, and
• wherein the data receiving unit is further configured to obtain the preset matrix based on the preset type information.